Add eXTRA-aggrressive git Garbage Collection

dotfiles/gittum/bin/xtragc

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+#
+# Perform extra aggressive garbage collection
+#
+
+
+du -hs .git
+git \
+    -c gc.reflogExpire=0 \
+    -c gc.reflogExpireUnreachable=0 \
+    -c gc.rerereresolved=0 \
+    -c gc.rerereunresolved=0 \
+    -c gc.pruneExpire=now \
+    gc
+du -hs .git

dotfiles/gittum/main.gitconfig

@@ -39,6 +39,7 @@
   sh = show
   who = ! ~/.gittum/bin/who
   whoo = ! ~/.gittum/bin/whoo
+  xtragc = ! ~/.gittum/bin/xtragc
 
 [diff]
     guitool = kdiff3